I don't have a side cover, but would like to tell you what I did to avoid mine from blowing off..
On the back side on the "AFT" end where the plastic pointy thing sticks out and goes into the rubber holder, I drilled a small hole in the base of the plastic and the inserted a small spring that is about 4 inches long. The other end of the spring is easily stretched and placed on the throttle cable "J" bolt/ adjuster.
NOTE: The spring is not very strong, but provides just enough "pull" to hold the side cover on. (see attached photo of light duty spring)
When I want to remove the side cover, I remove the aft end first, and carefully slip the front out and aft, then turn the side cover to where I can dis-connect the spring front he throttle cable.
I also have another small spring on the left side cover in the same drilled hole location on aft end, and the other end of spring is hooked to the alt..